R1 Crossplane Inline-4

Yamaha YZF-R1 style crossplane (CP4) inline-four rotating assembly: pistons, connecting rods, crankshaft. 79.0 x 50.9 mm bore/stroke, 998 cc, crank pin phases 0/270/90/180 deg for cylinders 1/2/3/4, firing order 1-3-2-4 at 270-180-90-180 deg intervals. Built to the shared interface spec sheet (specs.md).

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